<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="root">

    </div>
    <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>

    <!-- 依赖于核心库，将核心的功能与页面结合 -->
    <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    
    <script type="text/babel">
      let span = <span>我是span元素
        <div>
        haha</div>
      </span>
      ReactDOM.render(span,document.getElementById('root'))
    </script>
</body>

</html>